Note : read / write access to LUN is required when using “round robin” MPIO opposed to the default “vendor specific” which works with read only access. Else you will get an error – “not supported”

Repeat above per “device”

Confirm on Lefthand / P4000 CMC that the LUN has one connection per initiator Nic, and that each connection also has its DSM children (visible in CMC if working).

Confirm that the connection are as expected…

Run some disk benchmark utilities (iometer) and check that traffic is travelling over all the nics you have setup above. You can just use windows builtin task manager to do this.

Check that the right amount of connections are on the CMC for that particular LUN and initiator. So if you had 3 nodes via 2 initiator nics you would actually have 8 active connections in total (1 per nic (2) and an additional for every nic to each nodes (6))

Note : There are some reported issues with DMS and data corruption. Although i have not seen this myself please be diligent when it comes to data backup esp when production data is involved.